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Texas Instruments SNJ54BCT244FK
- Part No.:
- SNJ54BCT244FK
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SNJ54BCT244FK.pdf
- Description:
- 54BCT244 OCTAL BUFFERS/DRIVERS W
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Product details
Overview
SNJ54BCT244FK from Texas Instruments is a military-grade octal noninverting 3-state buffer/line driver in a 20-pin LCCC (FK) package, featuring dual 4-bit channels with independent active-low output-enable (OE) inputs, 48 mA low-level output drive at VCC = 4.5 V, and operation across −55°C to 125°C for high-reliability bus interfacing and memory address buffering.
For engineers reviewing the SNJ54BCT244FK datasheet, SNJ54BCT244FK pinout, SNJ54BCT244FK application, or SNJ54BCT244FK equivalent, this page delivers verified electrical specs, military-temperature performance data, FK-package terminal mapping, and direct alternatives for legacy aerospace and defense system design and obsolescence mitigation.
Technical Context
The SNJ54BCT244FK implements BiCMOS logic architecture to reduce ICCZ quiescent current while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and robust 5-V supply operation (4.5–5.5 V). Its P-N-P input stage minimizes DC loading on driving sources.
Each of its two 4-bit sections operates independently: when OE is low, A→Y signal propagation occurs with tPLH/tPHL ≤ 5.3 ns (max); when OE is high, outputs enter high-impedance state with IOZH/IOZL ≤ ±50 µA leakage, enabling multi-driver bus sharing without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and BCT logic systems. |
| Operating Temperature | −55°C to 125°C - Qualified for extended-range military and aerospace environments. |
| Output Drive (IOL) | 48 mA (min) at VCC = 4.5 V - Sufficient to drive 50-pF loads with fast edge rates in backplane and memory bus applications. |
| Propagation Delay | tPHL/tPLH ≤ 5.3 ns (max) - Enables reliable timing in high-speed address/data path buffering up to ~100 MHz. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - Matches standard TTL logic levels for seamless interface with legacy controllers and FPGAs. |
| ESD Protection | >2000 V per MIL-STD-883C Method 3015 - Provides handling robustness in production and field maintenance. |
| ICCZ Quiescent Current | 4–10 mA (max) - Significantly lower than bipolar-only equivalents, reducing standby power in always-on subsystems. |
Pinout & Package
LCCC (FK) package: 20-terminal leadless ceramic chip carrier, 8.89 mm × 8.89 mm body, 1.27 mm pitch, 2.03 mm max height, hermetically sealed for high-reliability mil-spec use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent enables for each 4-bit section; asserted low to enable A→Y pass-through, high for high-Z bus release. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight TTL-compatible inputs grouped into two 4-bit channels; accept standard logic levels with P-N-P input structure. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Octal noninverting outputs capable of sinking 48 mA; electrically isolated when OE is high. |
| VCC (Pin 10), GND (Pin 11) | Power supply terminals | Dual dedicated supply pins minimize switching noise coupling and support stable rail integrity under heavy load transients. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ by >50% vs. legacy bipolar BCT, lowering thermal load in dense military PCB layouts. |
| P-N-P input structure | Minimizes input DC loading (IIL ≤ −1 mA), preserving fanout capability when driving multiple inputs. |
| 3-state bus interface capability | Enables time-multiplexed sharing of common data/address buses among multiple SNJ54BCT244FK devices without external isolation. |
| MIL-STD-883 qualified | Meets screening requirements for shock, vibration, temperature cycling, and burn-in-critical for flight-critical avionics. |
| Hermetic LCCC (FK) packaging | Provides moisture resistance and long-term reliability in high-humidity or vacuum environments (e.g., satellite payload bays). |
Applications
| Aerospace Flight Control Bus | Military Radar Signal Processing |
|---|---|
Use Scenario: Buffering and isolating processor-generated address signals to multiple memory modules in a radiation-hardened flight computer. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing TTL-compatible drive strength and precise propagation delay matching across dual 4-bit lanes. Use Value: Enables deterministic timing closure in synchronous memory access cycles while preventing bus contention during DMA transfers. |
Use Scenario: Driving high-capacitance analog-to-digital converter (ADC) control lines and FPGA configuration buses in airborne radar front-end assemblies. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer ensuring clean, low-skew clock and strobe distribution under wide-temperature operation. Use Value: Maintains signal integrity across −55°C to 125°C without derating, supporting real-time sampling synchronization in pulsed RF systems. |
| Tactical Vehicle Data Acquisition | Secure Communications Crypto Module |
Use Scenario: Interfacing microcontroller I/O ports to ruggedized CAN and MIL-STD-1553 transceivers in armored vehicle electronic control units. IC Role / Device Role / Timing Role: Isolating MCU GPIO from noisy bus drivers via high-Z state control, minimizing ground bounce and EMI coupling. Use Value: Prevents false triggering of transceiver enable lines during transient voltage events on vehicle power rails. |
Use Scenario: Address multiplexing and register selection within tamper-resistant cryptographic co-processors deployed in secure comms terminals. IC Role / Device Role / Timing Role: Memory-mapped I/O expander with independent channel enables for segmented key register access. Use Value: Supports side-channel attack mitigation by enabling/disabling physical address paths under software-controlled timing windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT244FK | Advanced CMOS (ACT) family; higher noise immunity (VIH = 2.0 V, VIL = 0.8 V same), but lower drive (IOL = 24 mA), no BiCMOS ICCZ advantage. | Better for low-power, noise-sensitive digital logic; unsuitable for high-fanout bus loading where 48 mA sink is required. | Select only if system prioritizes noise margin over drive strength and thermal budget allows higher ICCZ. |
| 5962-9062501MRA (SNJ54BCT244J) | Same BCT244 logic, identical specs, but in 20-pin CDIP (J) package - through-hole, non-hermetic, larger footprint (1.27 cm² vs. FK's 0.79 cm²). | Preferred for prototyping or legacy board rework; not suitable for high-vibration or hermetic sealing requirements. | Choose SNJ54BCT244J only when LCCC assembly infrastructure is unavailable or mechanical mounting constraints favor DIP. |
Compared with SNJ54BCT244FK, the ACT244 alternative trades drive strength and quiescent efficiency for enhanced noise immunity, while the J-package variant retains full functional equivalence but sacrifices hermeticity and board-area efficiency-making SNJ54BCT244FK the sole choice for space-constrained, high-reliability mil-aero deployments.
Availability
SNJ54BCT244FK is available at Aetrix Electronics and suitable for aerospace flight control systems, military radar signal processing units, tactical vehicle data acquisition modules, and secure communications crypto hardware requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SNJ54BCT244FK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor leader with over 60 years of innovation in analog, embedded processing, and military-grade logic solutions, serving defense, aerospace, and industrial markets globally.
The SNJ54BCT244FK belongs to TI's military-qualified BCT logic family, designed specifically for high-reliability, high-density bus interfacing in systems where extended temperature operation, hermetic packaging, and MIL-STD-883 compliance are mandatory.
FAQ
What is the operating temperature range of the SNJ54BCT244FK?
The SNJ54BCT244FK is characterized for operation from −55°C to 125°C, meeting full military temperature specifications per MIL-STD-883. This range is validated across all electrical parameters including propagation delay, output drive, and input thresholds, making it suitable for deployment in jet engine bays, satellite payloads, and desert-deployed tactical radios where ambient extremes exceed commercial-grade limits.
Does the SNJ54BCT244FK support true 3-state (high-impedance) outputs?
Yes, the SNJ54BCT244FK provides true 3-state outputs: when either 1OE or 2OE is held high, the corresponding Y outputs enter a high-impedance state with leakage current ≤ ±50 µA (IOZH/IOZL), verified at VCC = 5.5 V. This enables safe bus sharing without external pull-ups or contention protection circuits in multi-driver architectures.
What package type is used for the SNJ54BCT244FK, and is it RoHS-compliant?
The SNJ54BCT244FK uses a 20-pin leadless ceramic chip carrier (LCCC) designated FK, with dimensions 8.89 mm × 8.89 mm and 1.27 mm pitch. It is not RoHS-compliant due to its tin-lead (SNPB) lead finish, consistent with legacy military qualification requirements; RoHS versions are not available for this specific part number.
How does the SNJ54BCT244FK differ from the commercial SN74BCT244 variants?
The SNJ54BCT244FK differs from SN74BCT244 variants in three key ways: it is screened to QML Class V military standards, operates across −55°C to 125°C (vs. 0°C to 70°C), and uses hermetic LCCC (FK) packaging (vs. plastic SOIC/DIP). Electrical specs are otherwise identical, but only SNJ54BCT244FK carries full MIL-PRF-38535 qualification.
Can the SNJ54BCT244FK be used as a direct replacement for SNJ54LS244 in existing designs?
No-the SNJ54BCT244FK is not a direct replacement for SNJ54LS244. While both are octal noninverting buffers, the BCT version offers significantly higher output drive (48 mA vs. LS's 8 mA), faster propagation (≤5.3 ns vs. ≤15 ns), and BiCMOS input structure. Swapping requires validation of bus capacitance, termination, and power delivery margins due to increased transient current demands.
SNJ54BCT244FK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54BCT244FK FAQ
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7.What is the process for return or replacement of SNJ54BCT244FK?
All SNJ54BCT244FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT244FK, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SNJ54BCT244FK part is unused and in its original packaging.
Return procedure for SNJ54BCT244FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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